Who is Dr. Marie and why do we care about her opinion?

Sorry. I don't take only one person's word for anything.
I've been in therapy on and off my entire adult life. It has actually been quite helpful each time, but each time in a different way. You see, our needs, our problems, our goals, etc. change as we grow and mature. I have found what I deal with in therapy changes pretty regularly. So, although I have been in therapy for many years, I don't feel like it has been all about the same issues this whole time. I would say that if a person was actually stuck on exactly the same issues without any movement forward after so long, there is probably a problem there, but I doubt that is very often the case.